Napkin holder



FIG. 1 is a perspective view of a napkin holder showing our new design.

FIG. 2 is a front view thereof.

FIG. 3 is a left side view thereof; and,

FIG. 4 is a top view thereof.

The broken lines in the figures illustrate the portions of the design that form no part of the claimed design. 

CLAIM The ornamental design for a napkin holder, as shown and described. 